/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#define USING_LOG_PREFIX SQL_EXE
#include "ob_expr_week_of_func.h"
#include "lib/timezone/ob_time_convert.h"
#include "share/object/ob_obj_cast.h"
#include "ob_expr_extract.h"
#include "share/ob_time_utility2.h"
#include "sql/session/ob_sql_session_info.h"
#include "sql/engine/ob_exec_context.h"
#include "sql/engine/expr/ob_datum_cast.h"

using namespace oceanbase::share;
using namespace oceanbase::sql;

namespace oceanbase {
namespace sql {

ObExprWeekOfYear::ObExprWeekOfYear(ObIAllocator& alloc)
    : ObFuncExprOperator(alloc, T_FUN_SYS_WEEK_OF_YEAR, N_WEEK_OF_YEAR, 1, NOT_ROW_DIMENSION)
{}
ObExprWeekOfYear::~ObExprWeekOfYear()
{}
int ObExprWeekOfYear::calc_result1(ObObj& result, const ObObj& obj, ObExprCtx& expr_ctx) const
{
  int ret = OB_SUCCESS;
  int64_t week = 0;
  ObTime ot;
  if (OB_ISNULL(expr_ctx.my_session_) || OB_ISNULL(expr_ctx.exec_ctx_)) {
    ret = OB_NOT_INIT;
    LOG_WARN("session ptr or exec ctx is null", K(ret), K(expr_ctx.my_session_));
  } else if (OB_UNLIKELY(obj.is_null())) {
    result.set_null();
  } else if (OB_FAIL(ob_obj_to_ob_time_with_date(obj, get_timezone_info(expr_ctx.my_session_), ot,
                get_cur_time(expr_ctx.exec_ctx_->get_physical_plan_ctx()), false))) {
    LOG_WARN("cast to ob time failed", K(ret), K(obj), K(expr_ctx.cast_mode_));
    if (CM_IS_WARN_ON_FAIL(expr_ctx.cast_mode_)) {
      ret = OB_SUCCESS;
    }
    result.set_null();
  } else if (ot.parts_[DT_YEAR] <= 0) {
    result.set_null();
  } else {
    week = ObTimeConverter::ob_time_to_week(ot, DT_WEEK_GE_4_BEGIN);
    result.set_int(week);
  }
  return ret;
}

int ObExprWeekOfYear::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
  UNUSED(op_cg_ctx);
  UNUSED(raw_expr);
  int ret = OB_SUCCESS;
  if (rt_expr.arg_cnt_ != 1) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("weekofyear expr should have one param", K(ret), K(rt_expr.arg_cnt_));
  } else if (OB_ISNULL(rt_expr.args_) || OB_ISNULL(rt_expr.args_[0])) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("children of weekofyear expr is null", K(ret), K(rt_expr.args_));
  } else {
    rt_expr.eval_func_ = ObExprWeekOfYear::calc_weekofyear;
  }
  return ret;
}

int ObExprWeekOfYear::calc_weekofyear(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
  int ret = OB_SUCCESS;
  ObDatum* param_datum = NULL;
  int64_t week = 0;
  ObTime ot;
  const ObSQLSessionInfo* session = NULL;
  if (OB_ISNULL(session = ctx.exec_ctx_.get_my_session())) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("session is null", K(ret));
  } else if (OB_FAIL(expr.args_[0]->eval(ctx, param_datum))) {
    LOG_WARN("eval param value failed");
  } else if (OB_UNLIKELY(param_datum->is_null())) {
    expr_datum.set_null();
  } else if (OB_FAIL(ob_datum_to_ob_time_with_date(*param_datum,
                 expr.args_[0]->datum_meta_.type_,
                 get_timezone_info(session),
                 ot,
                 get_cur_time(ctx.exec_ctx_.get_physical_plan_ctx()),
                 false))) {
    LOG_WARN("cast to ob time failed", K(ret));
    uint64_t cast_mode = 0;
    ObSQLUtils::get_default_cast_mode(session->get_stmt_type(), session, cast_mode);
    if (CM_IS_WARN_ON_FAIL(cast_mode)) {
      ret = OB_SUCCESS;
    }
    expr_datum.set_null();
  } else if (ot.parts_[DT_YEAR] <= 0) {
    expr_datum.set_null();
  } else {
    week = ObTimeConverter::ob_time_to_week(ot, DT_WEEK_GE_4_BEGIN);
    expr_datum.set_int(week);
  }
  return ret;
}

ObExprWeekDay::ObExprWeekDay(ObIAllocator& alloc)
    : ObFuncExprOperator(alloc, T_FUN_SYS_WEEKDAY_OF_DATE, N_WEEKDAY_OF_DATE, 1, NOT_ROW_DIMENSION)
{}
ObExprWeekDay::~ObExprWeekDay()
{}
int ObExprWeekDay::calc_result1(ObObj& result, const ObObj& obj, ObExprCtx& expr_ctx) const
{
  int ret = OB_SUCCESS;
  int64_t weekday = 0;
  ObTime ot;
  if (OB_ISNULL(expr_ctx.my_session_) || OB_ISNULL(expr_ctx.exec_ctx_)) {
    ret = OB_NOT_INIT;
    LOG_WARN("session ptr or exec ctx is null", K(ret), K(expr_ctx.my_session_));
  } else if (OB_UNLIKELY(obj.is_null())) {
    result.set_null();
  } else if (OB_FAIL(ob_obj_to_ob_time_with_date(obj, get_timezone_info(expr_ctx.my_session_), ot,
                get_cur_time(expr_ctx.exec_ctx_->get_physical_plan_ctx()), false))) {
    LOG_WARN("cast to ob time failed", K(ret), K(obj), K(expr_ctx.cast_mode_));
    if (CM_IS_WARN_ON_FAIL(expr_ctx.cast_mode_)) {
      ret = OB_SUCCESS;
    }
    result.set_null();
  } else if (ot.parts_[DT_YEAR] <= 0) {
    result.set_null();
  } else {
    weekday = ot.parts_[DT_WDAY] - 1;
    result.set_int(weekday);
  }
  return ret;
}

int ObExprWeekDay::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
  UNUSED(op_cg_ctx);
  UNUSED(raw_expr);
  int ret = OB_SUCCESS;
  if (rt_expr.arg_cnt_ != 1) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("weekday expr should have one param", K(ret), K(rt_expr.arg_cnt_));
  } else if (OB_ISNULL(rt_expr.args_) || OB_ISNULL(rt_expr.args_[0])) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("children of weekday expr is null", K(ret), K(rt_expr.args_));
  } else {
    rt_expr.eval_func_ = ObExprWeekDay::calc_weekday;
  }
  return ret;
}

int ObExprWeekDay::calc_weekday(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
  int ret = OB_SUCCESS;
  ObDatum* param_datum = NULL;
  int64_t week = 0;
  ObTime ot;
  const ObSQLSessionInfo* session = NULL;
  if (OB_ISNULL(session = ctx.exec_ctx_.get_my_session())) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("session is null", K(ret));
  } else if (OB_FAIL(expr.args_[0]->eval(ctx, param_datum))) {
    LOG_WARN("eval param value failed");
  } else if (OB_UNLIKELY(param_datum->is_null())) {
    expr_datum.set_null();
  } else if (OB_FAIL(ob_datum_to_ob_time_with_date(*param_datum,
                 expr.args_[0]->datum_meta_.type_,
                 get_timezone_info(session),
                 ot,
                 get_cur_time(ctx.exec_ctx_.get_physical_plan_ctx()),
                 false))) {
    LOG_WARN("cast to ob time failed", K(ret));
    uint64_t cast_mode = 0;
    ObSQLUtils::get_default_cast_mode(session->get_stmt_type(), session, cast_mode);
    if (CM_IS_WARN_ON_FAIL(cast_mode)) {
      ret = OB_SUCCESS;
    }
    expr_datum.set_null();
  } else if (ot.parts_[DT_YEAR] <= 0) {
    expr_datum.set_null();
  } else {
    int64_t weekday = ot.parts_[DT_WDAY] - 1;
    expr_datum.set_int(weekday);
  }
  return ret;
}

ObExprYearWeek::ObExprYearWeek(ObIAllocator& alloc)
    : ObFuncExprOperator(alloc, T_FUN_SYS_YEARWEEK_OF_DATE, N_YEARWEEK_OF_DATE, ONE_OR_TWO, NOT_ROW_DIMENSION)
{}
ObExprYearWeek::~ObExprYearWeek()
{}

int ObExprYearWeek::calc_result_typeN(
    ObExprResType& type, ObExprResType* types_stack, int64_t param_num, ObExprTypeCtx& type_ctx) const
{
  UNUSED(type_ctx);
  int ret = OB_SUCCESS;
  if (OB_ISNULL(types_stack)) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("null types", K(ret));
  } else if (OB_UNLIKELY(param_num > 2)) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("param num is not correct", K(param_num));
  } else {
    if (2 == param_num) {
      types_stack[1].set_calc_type(common::ObIntType);
    }
    if (ob_is_enumset_tc(types_stack[0].get_type())) {
      types_stack[0].set_calc_type(common::ObVarcharType);
    }
  }
  if (OB_SUCC(ret)) {
    type.set_int();
    type.set_scale(common::DEFAULT_SCALE_FOR_INTEGER);
    type.set_precision(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].precision_);
  }
  return ret;
}

// reference: https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html for meaning of mode.
template <typename T>
static int ob_expr_calc_yearweek(
    const int64_t& mode_value, const ObTime& ot, int64_t& week_value, ObDTMode mode, T& result)
{
  int ret = OB_SUCCESS;
  int64_t week = 0;
  int64_t year = 0;
  int32_t delta = 0;
  int64_t flag = 0;
  flag = (mode_value % 8 >= 0 ? mode_value % 8 : 8 + (mode_value % 8));
  switch (flag) {
    case 0:  // First week of a year start with Sunday. Sunday is the start of a week.
      week = ObTimeConverter::ob_time_to_week(ot, DT_WEEK_SUN_BEGIN + mode, delta);
      break;
    case 2:
      week = ObTimeConverter::ob_time_to_week(ot, DT_WEEK_SUN_BEGIN, delta);
      break;
    case 1:  // First week of a year more than three days. Monday is the start of a week.
      week = ObTimeConverter::ob_time_to_week(ot, DT_WEEK_GE_4_BEGIN + mode, delta);
      break;
    case 3:
      week = ObTimeConverter::ob_time_to_week(ot, DT_WEEK_GE_4_BEGIN, delta);
      break;
    case 4:  // First week of a year more than three days. Sunday is the start of a week.
      week = ObTimeConverter::ob_time_to_week(ot, DT_WEEK_GE_4_BEGIN + DT_WEEK_SUN_BEGIN + mode, delta);
      break;
    case 6:
      week = ObTimeConverter::ob_time_to_week(ot, DT_WEEK_GE_4_BEGIN + DT_WEEK_SUN_BEGIN, delta);
      break;
    case 5:  // First week of a year start with Monday. Monday is the start of a week.
      week = ObTimeConverter::ob_time_to_week(ot, mode, delta);
      break;
    case 7:
      week = ObTimeConverter::ob_time_to_week(ot, 0, delta);
      break;
    default:
      ret = OB_ERR_UNEXPECTED;
      LOG_WARN("unexpected flag value", K(ret), K(flag), K(mode));
      break;
  }
  if (OB_SUCC(ret)) {
    year = ot.parts_[DT_YEAR] + delta;
    week_value = week;
    result.set_int(year * 100 + week);
  }
  return ret;
}

int ObExprYearWeek::calc_resultN(
    common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const
{
  int ret = OB_SUCCESS;
  int64_t mode_value = 0;
  int64_t week = 0;
  ObTime ot;
  if (OB_ISNULL(expr_ctx.my_session_) || OB_ISNULL(expr_ctx.exec_ctx_)) {
    ret = OB_NOT_INIT;
    LOG_WARN("session ptr or exec ctx is null", K(ret), K(expr_ctx.my_session_));
  } else if (OB_ISNULL(objs_stack)) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("null stack", KP(objs_stack), K(ret));
  } else if (OB_UNLIKELY(param_num > 2)) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("param num error", K(param_num));
  } else if (OB_FAIL(ob_obj_to_ob_time_with_date(objs_stack[0], get_timezone_info(expr_ctx.my_session_),
                  ot, get_cur_time(expr_ctx.exec_ctx_->get_physical_plan_ctx()), false))) {
    LOG_WARN("cast to ob time failed", K(ret), K(objs_stack[0]), K(expr_ctx.cast_mode_));
    ret = OB_SUCCESS;
    result.set_null();
  } else if (ot.parts_[DT_YEAR] <= 0) {
    result.set_null();
  } else {
    if (2 == param_num) {
      mode_value = objs_stack[1].get_int();
    }
    ret = ob_expr_calc_yearweek(mode_value, ot, week, 0, result);
  }
  return ret;
}

int ObExprYearWeek::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
  UNUSED(op_cg_ctx);
  UNUSED(raw_expr);
  int ret = OB_SUCCESS;
  if (rt_expr.arg_cnt_ != 1 && rt_expr.arg_cnt_ != 2) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("yearweek expr should have one or two params", K(ret), K(rt_expr.arg_cnt_));
  } else if (OB_ISNULL(rt_expr.args_) || OB_ISNULL(rt_expr.args_[0])) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("children of yearweek expr is null", K(ret), K(rt_expr.args_));
  } else if (2 == rt_expr.arg_cnt_ && OB_ISNULL(rt_expr.args_[1])) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("second child of yearweek expr is null", K(ret), K(rt_expr.args_));
  } else {
    rt_expr.eval_func_ = ObExprYearWeek::calc_yearweek;
  }
  return ret;
}

int ObExprYearWeek::calc_yearweek(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
  int ret = OB_SUCCESS;
  ObDatum* param_datum = NULL;
  int64_t mode_value = 0;
  int64_t week = 0;
  ObTime ot;
  const ObSQLSessionInfo* session = NULL;
  if (OB_ISNULL(session = ctx.exec_ctx_.get_my_session())) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("session is null", K(ret));
  } else if (OB_FAIL(expr.args_[0]->eval(ctx, param_datum))) {
    LOG_WARN("eval param value failed");
  } else if (OB_UNLIKELY(param_datum->is_null())) {
    expr_datum.set_null();
  } else if (OB_FAIL(ob_datum_to_ob_time_with_date(*param_datum,
                 expr.args_[0]->datum_meta_.type_,
                 get_timezone_info(session),
                 ot,
                 get_cur_time(ctx.exec_ctx_.get_physical_plan_ctx()),
                 false))) {
    LOG_WARN("cast to ob time failed", K(ret));
    uint64_t cast_mode = 0;
    ObSQLUtils::get_default_cast_mode(session->get_stmt_type(), session, cast_mode);
    if (CM_IS_WARN_ON_FAIL(cast_mode)) {
      ret = OB_SUCCESS;
    }
    expr_datum.set_null();
  } else if (ot.parts_[DT_YEAR] <= 0) {
    expr_datum.set_null();
  } else {
    if (2 == expr.arg_cnt_) {
      ObDatum* param_datum2 = NULL;
      if (OB_FAIL(expr.args_[1]->eval(ctx, param_datum2))) {
        LOG_WARN("eval param value failed");
      } else if (OB_LIKELY(!param_datum2->is_null())) {
        mode_value = param_datum2->get_int();
      }
    }
    if (OB_SUCC(ret)) {
      ret = ob_expr_calc_yearweek(mode_value, ot, week, 0, expr_datum);
    }
  }
  return ret;
}

ObExprWeek::ObExprWeek(ObIAllocator& alloc)
    : ObFuncExprOperator(alloc, T_FUN_SYS_WEEK, N_WEEK, ONE_OR_TWO, NOT_ROW_DIMENSION)
{}
ObExprWeek::~ObExprWeek()
{}

int ObExprWeek::calc_result_typeN(
    ObExprResType& type, ObExprResType* types_stack, int64_t params_count, common::ObExprTypeCtx& type_ctx) const
{
  UNUSED(type_ctx);
  int ret = OB_SUCCESS;
  if (OB_ISNULL(types_stack)) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("null types", K(ret));
  } else if (OB_UNLIKELY(params_count > 2)) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("param num is not correct", K(params_count));
  } else {
    if (2 == params_count) {
      types_stack[1].set_calc_type(common::ObIntType);
    }
    if (ob_is_enumset_tc(types_stack[0].get_type())) {
      types_stack[0].set_calc_type(common::ObVarcharType);
    }
  }
  if (OB_SUCC(ret)) {
    type.set_int();
    type.set_scale(common::DEFAULT_SCALE_FOR_INTEGER);
    type.set_precision(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].precision_);
  }
  return ret;
}

int ObExprWeek::calc_resultN(ObObj& result, const ObObj* params, int64_t params_count, ObExprCtx& expr_ctx) const
{
  int ret = OB_SUCCESS;
  int64_t mode_value = 0;
  int64_t week = 0;
  ObTime ot;
  if (OB_ISNULL(params)) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("null stack", KP(params), K(ret));
  } else if (OB_UNLIKELY(params_count > 2)) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("param num error", K(params_count));
  } else if (OB_ISNULL(expr_ctx.my_session_) || OB_ISNULL(expr_ctx.exec_ctx_)) {
    ret = OB_NOT_INIT;
    LOG_WARN("session ptr or exec ctx is null", K(ret), K(expr_ctx.my_session_));
  } else {
    const ObObj& date_arg = params[0];
    if (2 == params_count) {
      mode_value = params[1].get_int();
    }
    if (OB_UNLIKELY(date_arg.is_null())) {
      result.set_null();
    } else if (OB_FAIL(ob_obj_to_ob_time_with_date(date_arg, get_timezone_info(expr_ctx.my_session_),
                  ot, get_cur_time(expr_ctx.exec_ctx_->get_physical_plan_ctx()), false))) {
      LOG_WARN("cast to ob time failed", K(ret), K(date_arg), K(expr_ctx.cast_mode_));
      if (CM_IS_WARN_ON_FAIL(expr_ctx.cast_mode_)) {
        LOG_WARN("cast to ob time failed", K(ret), K(expr_ctx.cast_mode_));
        LOG_USER_WARN(OB_ERR_CAST_VARCHAR_TO_TIME);
        ret = OB_SUCCESS;
      }
      result.set_null();
    } else if (ot.parts_[DT_YEAR] <= 0) {
      result.set_null();
    } else {
      ret = ob_expr_calc_yearweek(mode_value, ot, week, DT_WEEK_ZERO_BEGIN, result);
      if (OB_FAIL(ret)) {
        LOG_WARN("cal yearweek failed", K(ret), K(mode_value), K(ot));
      } else {
        result.set_int(week);
      }
    }
  }
  return ret;
}

int ObExprWeek::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
  UNUSED(op_cg_ctx);
  UNUSED(raw_expr);
  int ret = OB_SUCCESS;
  if (rt_expr.arg_cnt_ != 1 && rt_expr.arg_cnt_ != 2) {
    ret = OB_INVALID_ARGUMENT;
    LOG_WARN("week expr should have one or two params", K(ret), K(rt_expr.arg_cnt_));
  } else if (OB_ISNULL(rt_expr.args_) || OB_ISNULL(rt_expr.args_[0])) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("children of week expr is null", K(ret), K(rt_expr.args_));
  } else if (2 == rt_expr.arg_cnt_ && OB_ISNULL(rt_expr.args_[1])) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("second child of week expr is null", K(ret), K(rt_expr.args_));
  } else {
    rt_expr.eval_func_ = ObExprWeek::calc_week;
  }
  return ret;
}

int ObExprWeek::calc_week(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
  int ret = OB_SUCCESS;
  ObDatum* param_datum = NULL;
  int64_t mode_value = 0;
  int64_t week = 0;
  ObTime ot;
  const ObSQLSessionInfo* session = NULL;
  if (OB_ISNULL(session = ctx.exec_ctx_.get_my_session())) {
    ret = OB_ERR_UNEXPECTED;
    LOG_WARN("session is null", K(ret));
  } else if (OB_FAIL(expr.args_[0]->eval(ctx, param_datum))) {
    LOG_WARN("eval param value failed");
  } else if (OB_UNLIKELY(param_datum->is_null())) {
    expr_datum.set_null();
  } else if (OB_FAIL(ob_datum_to_ob_time_with_date(*param_datum,
                 expr.args_[0]->datum_meta_.type_,
                 get_timezone_info(session),
                 ot,
                 get_cur_time(ctx.exec_ctx_.get_physical_plan_ctx()),
                 false))) {
    LOG_WARN("cast to ob time failed", K(ret));
    uint64_t cast_mode = 0;
    ObSQLUtils::get_default_cast_mode(session->get_stmt_type(), session, cast_mode);
    if (CM_IS_WARN_ON_FAIL(cast_mode)) {
      LOG_WARN("cast to ob time failed", K(ret));
      LOG_USER_WARN(OB_ERR_CAST_VARCHAR_TO_TIME);
      ret = OB_SUCCESS;
    }
    expr_datum.set_null();
  } else if (ot.parts_[DT_YEAR] <= 0) {
    expr_datum.set_null();
  } else {
    if (2 == expr.arg_cnt_) {
      ObDatum* param_datum2 = NULL;
      if (OB_FAIL(expr.args_[1]->eval(ctx, param_datum2))) {
        LOG_WARN("eval param value failed");
      } else if (OB_LIKELY(!param_datum2->is_null())) {
        mode_value = param_datum2->get_int();
      }
    }
    if (OB_SUCC(ret)) {
      if (OB_FAIL(ob_expr_calc_yearweek(mode_value, ot, week, DT_WEEK_ZERO_BEGIN, expr_datum))) {
        LOG_WARN("cal yearweek failed", K(ret), K(mode_value), K(ot));
      } else {
        expr_datum.set_int(week);
      }
    }
  }
  return ret;
}

}  // namespace sql
}  // namespace oceanbase
